/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.servlet;

import java.util.EventListener;

/** Implementations of this interface receive notifications of
** changes to the attribute list on the servlet context of a web application. 
* To receive notification events, the implementation class
* must be configured in the deployment descriptor for the web application.
* @see ServletContextAttributeEvent
 * @since	v 2.3
*/

public interface ServletContextAttributeListener extends EventListener {
/** Notification that a new attribute was added to the servlet context. Called after the attribute is added.*/
public void attributeAdded(ServletContextAttributeEvent scab);
/** Notification that an existing attribute has been removed from the servlet context. Called after the attribute is removed.*/
public void attributeRemoved(ServletContextAttributeEvent scab);
/** Notification that an attribute on the servlet context has been replaced. Called after the attribute is replaced. */
public void attributeReplaced(ServletContextAttributeEvent scab);
}

